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5 Best Commercial Cleaning Services in Denver (2026)

Ranked by real Google ratings and review volume · How we chose

Brad Smith
By Brad Smith, Home Services Expert · ✓ Updated · 7 min read

We compared 18 commercial cleaning services in Denver on Google Maps · 5 listed · How we rank

An office cleaner is judged at 7 a.m., when the trash is gone and the restrooms are stocked, or when they aren't. The commercial cleaning services in Denver listed here hold more than 1,000 Google reviews between them, rated from 4.7 to 5.0, so the choice comes down to scale, franchise or independent, and whether the business has cleaned a space like yours.

Short answer: JAN-PRO has the most Google reviews of any Denver commercial cleaner here, 4.8 stars from more than 400 reviews. Mop Stars Cleaning Service (4.9) follows on volume, though its reviews describe cleaning homes. 3AClean and Big League Clean are both rated 5.0 on smaller review bases, and Corvus Janitorial Systems holds a 4.7.
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Denver Janitorial Companies Compared

# Business Rating Reviews Best for
1 JAN-PRO 4.8 ★ 409 Offices and larger facilities View ›
2 Mop Stars Cleaning Service 4.9 ★ 331 Homes first, plus small businesses View ›
3 3AClean 5.0 ★ 112 Janitorial and clinics View ›
4 Big League Clean 5.0 ★ 84 Schools, apartments and offices View ›
5 Corvus Janitorial Systems 4.7 ★ 67 Mid-sized office buildings View ›
5 Best Commercial Cleaning Services in Denver (2026)

The cleaners, reviewed

JAN-PRO logo
#1 Overall🕑 Open 5 days/wk↩ Responds to reviews

JAN-PRO

4.8409 Google reviews

JAN-PRO is the Denver office of a national commercial cleaning franchise brand, based on South Bellaire Street. Its site lists janitorial and day porter work, disinfecting, carpet, tile and floor care, floor stripping and waxing, post-construction cleaning and window cleaning. It names offices, banks, dental offices, daycare centers, schools, fitness centers and property management among the facilities it cleans.

What people praise

  • Reviewers describe an account rep who checks in regularly and answers quickly
  • One customer had a same-day visit from the rep to set up a weekend clean
  • A reviewer says the crew warns them when supplies run low and is flexible around holiday closures
  • Cleaners are described as consistent and hardworking

Worth knowing

  • Owner replies refer to franchise owners doing the cleaning, so ask who will be assigned to your building
Reputation scorecardrank in Denver
Rating4.8 / 5
Review volume409 · 97th
Confidencehigh
Recency2 months ago
Info completenesssite · phone · hours
Rating breakdown92% 5-star
✓ VerifiedSource: Google

Our take: The largest review base on this page, at 4.8, and a long list of services on its site. A sensible first quote for an office or multi-room facility.

Website+1720-740-4720 Directions

1720 S Bellaire St #600, Denver, CO 80222

Mop Stars Cleaning Service logo
#2🕑 Open 6 days/wk↩ Responds to reviews

Mop Stars Cleaning Service

4.9331 Google reviews

Mop Stars Cleaning Service is a Denver cleaning company whose site describes cleaning for both homes and businesses across the metro. The site pairs residential services with commercial ones. It works Monday to Friday, with Saturday hours as well.

What people praise

  • Reviewers describe punctual teams that arrive when scheduled
  • The owner is described as responsive and good at managing his teams
  • Customers say the cleaners are thorough, and some mention appliances and floorboards
  • Reviewers who mention price call it competitive

Worth knowing

  • The reviews describe a home, apartment or rental, so ask for commercial references before booking an office
Reputation scorecardrank in Denver
Rating4.9 / 5
Review volume331 · 92nd
Confidencehigh
Recency3 months ago
Info completenesssite · phone · hours
Rating breakdown93% 5-star
✓ VerifiedSource: Google

Our take: Rated 4.9 across more than 330 reviews, but its feedback is about residential work. Consider it for a small office if the quote and references check out.

Website+1303-481-1976 Directions

1800 Lawrence St APT 407, Denver, CO 80202

3A
#3🕑 Open 7 days↩ Responds to reviews

3AClean

5.0112 Google reviews

3AClean is a janitorial company based on West 16th Avenue in Lakewood. Its site lists commercial janitorial cleaning, healthcare and medical sanitization, industrial and warehouse cleaning, office cleaning, day porter service, post-construction cleaning, floor care and school cleaning. It names Denver, Lakewood, Englewood, Boulder, Broomfield, Aurora, Castle Rock, Littleton and Thornton as areas it serves.

What people praise

  • Customers name individual cleaners and call them professional, kind and prepared
  • A reviewer from a large building says the restrooms stay clean, including a midday check
  • A clinic reviewer says the cleaners are good with patients around
  • One reviewer's stockroom and restroom were cleaned to a standard that exceeded their expectations

Worth knowing

  • The 5.0 rests on a smaller review base than JAN-PRO or Mop Stars
Reputation scorecardrank in Denver
Rating5 / 5
Review volume112 · 81st
Confidencemoderate
Recency4 months ago
Info completenesssite · phone · hours
Rating breakdown98% 5-star
✓ VerifiedSource: Google

Our take: A perfect 5.0 across more than 110 reviews, with feedback from offices, a clinic and large buildings. Based in Lakewood, so confirm its schedule for a Denver address.

Website+1303-716-2802 Directions

6006 W 16th Ave, Lakewood, CO 80214

Big League Clean logo
#4🕑 Open 7 days↩ Responds to reviews

Big League Clean

5.084 Google reviews

Big League Clean is a commercial cleaning company with a Denver location on Larimer Street. Its site lists janitorial, office, carpet and window cleaning, plus school, medical facility, apartment complex, warehouse and post-construction work, and says it offers month-to-month service without contracts. Reviewers describe it cleaning an apartment building, a preschool, a medical facility and offices.

What people praise

  • Reviewers mention a dedicated point of contact, one of the owners
  • A preschool reviewer says the crew adjusts its timing around parent meetings and events
  • Customers describe a thorough clean of floors, restrooms and desks
  • Clear communication before the first clean is mentioned

Worth knowing

  • Its perfect rating rests on a smaller review base than JAN-PRO or Mop Stars
Reputation scorecardrank in Denver
Rating5 / 5
Review volume84 · 75th
Confidencemoderate
Recency12 months ago
Info completenesssite · phone · hours
Rating breakdown100% 5-star
✓ VerifiedSource: Google

Our take: Every Google rating it holds is five stars, across more than 80 reviews. Ask for a reference from a facility like yours, since the praise in its reviews is general.

Website+1720-896-7368 Directions

1550 Larimer St, Denver, CO 80202

Corvus Janitorial Systems logo
#5🕑 Open 5 days/wk↩ Responds to reviews

Corvus Janitorial Systems

4.767 Google reviews

Corvus Janitorial Systems is a Denver location of a multi-city commercial cleaning franchise brand, with an office on South Oneida Street. Its site lists offices, schools, daycare, medical facilities, gyms, warehouses, car dealerships, religious facilities and government buildings among the places it cleans, plus disinfection and green cleaning.

What people praise

  • Customers who have used it for several years describe satisfied, long-running accounts
  • An account manager is praised for being communicative and professional
  • A building manager says the pricing is reasonable and the team proactive about materials
  • A tenant-facing office building reviewer reports consistently high quality work

Worth knowing

  • It has the smallest review base on this page, and a few one-star ratings among them
Reputation scorecardrank in Denver
Rating4.7 / 5
Review volume67 · 69th
Confidenceearly
Recency8 weeks ago
Info completenesssite · phone · hours
Rating breakdown91% 5-star
✓ VerifiedSource: Google

Our take: A 4.7 across more than 60 reviews, with multi-year office customers. A reasonable third quote, especially if you want a franchise with an account manager.

Website+1720-287-2964 Directions

2020 S Oneida St Ste 201, Denver, CO 80224

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How the scores work

Each number comes from public Google data on the date shown. Rating is the live Google star average. Review volume is how many customers have rated the business, set against other Denver cleaning companies. Confidence weighs the rating by that volume, so a 4.8 from hundreds of people counts for more than a 5.0 from a handful. Recency reflects how recently customers are still leaving reviews. No business can pay to change these numbers.

How commercial cleaning is priced in Denver

Commercial cleaners quote by the building, not by the hour. Square footage, number of restrooms, how many days a week they visit, whether they work after hours and what supplies they supply all move the number. Floor stripping, carpet and window work are usually quoted separately from regular janitorial. Ask each company for a written proposal after a walkthrough, and compare what is included.

Where these cleaners work around Denver

3AClean’s site lists Denver, Lakewood, Englewood, Boulder, Broomfield, Aurora, Castle Rock, Littleton and Thornton, while Big League Clean’s lists Centennial, Aurora, Lakewood, Thornton, Arvada, Englewood and Littleton. Searching for commercial cleaners near me? Each card shows a phone number and a map link, so you can call the closest office.

Questions to ask a Denver janitorial company

  • Will your own employees clean my building, or a franchise owner’s crew?
  • Is service month-to-month or on a contract, and what is the notice to cancel?
  • Are supplies and equipment included in the quote?
  • Can you clean after hours, and who holds the keys and alarm codes?
  • Have you cleaned a space like mine, such as a clinic, school or warehouse, and can I speak to that customer?

Frequently asked questions

Which Denver commercial cleaners are franchises?

JAN-PRO and Corvus Janitorial Systems both operate under national franchise brands, and each site carries a franchise-opportunity link. Owner replies on both pages refer to franchise owners. Big League Clean’s site calls it locally owned.

Can a Denver commercial cleaner handle a clinic or a school?

3AClean’s site lists healthcare sanitization and school cleaning, and one reviewer describes cleaners working in their clinic. Big League Clean’s reviewers include a preschool and a medical facility, and JAN-PRO and Corvus both list medical facilities and schools among the places they clean.

Do these companies serve suburbs like Aurora and Lakewood?

3AClean’s site lists Aurora, Lakewood, Englewood, Littleton and Thornton, and Big League Clean’s lists those plus Arvada and Centennial. 3AClean itself is based in Lakewood.

Choosing a janitorial company

JAN-PRO is the safe default for an office, with the most reviews on this page and a clear service list. 3AClean is the one to call for a clinic or a large building. Whichever you pick, ask for a walkthrough quote in writing and a reference from a similar facility.

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